Sudden Motion Sensor on rMBP

Discussion in 'MacBook Pro' started by belard, Dec 1, 2012.

  1. belard, Dec 1, 2012
    Last edited: Dec 1, 2012

    belard macrumors newbie

    Jun 3, 2008
    I just bought a 13' retina MacBook Pro and installed LiquidMac just for the heck of it. It works, apart from slight graphics glitches.
    But that struck me as odd; LiquidMac works (as stated on the developer's website by reading the accelerometer that serves as SMS on hard disk equipped MacBooks.
    The app hasn't been updated since long before the rMBP came along, so it definitely uses the SMS API; thus, if the rMBP was built from the start as a solid state computer (at least as far as storage is concerned), why should it have a sudden motion sensor? It's not used for anything else. Of course, some apps have come along that use it, and maybe Apple included it for compatibility's sake, but AFAIK the MacBook Airs don't have it, and including a hardware device that isn't used by the OS itself just to maintain backwards compatibility strikes me as very un-Apple.

    (I am thoroughly puzzled by this.)
  2. belard thread starter macrumors newbie

    Jun 3, 2008
  3. MushroomMan macrumors member


    May 31, 2015
    It does sound puzzling, and quite the thread revival - maybe the accelerometer is used for purposes other than just stopping the HDD spinning?
  4. belard thread starter macrumors newbie

    Jun 3, 2008
    After a further bit of looking around, and confirmation that it doesn't turn off the fans — which I checked by chucking it in the air while playing four HD videos — there are two possibilities:

    1- It's built into some other chip and it's so cheap that it doesn't matter
    2- As read on reddit, it's a ploy by Apple so that people are tempted to do "drunk lightsaber **** with their laptops and smash them, necessitating a replacement. But that is merely a conspiracy theory."
  5. Samuelsan2001 macrumors 604

    Oct 24, 2013
    Some apps use an accelerometer, I think there used to be one on the app store that even used it to measure seismic activity...

Share This Page